Everything you need to know about rainwater collection via the roof


Abundant rainwater falls out of the sky for free. It would be a shame not to collect this water and make maximum use of it. In the Benelux, rainwater collection is sometimes even compulsory. Find out how you can collect rainwater via your roof.

Why collect rainwater?

The main advantage of rainwater is of course that it is free, unlike tap water. That means you save a lot on your water bill and supplementary environmental tax if you are able to collect the rainwater effectively. In many cases, rainwater is an excellent alternative to tap water. You can use it to:

  • spray the garden
  • flush the toilet
  • do the washing

How can you collect rainwater?

In principle, a rainwater collection system is extremely simple. It consists of just three elements:

  • a collection area (the roof of the house)
  • a gutter with drain that leads the water to the rainwater tank
  • a rainwater tank with a suitable filter system

Both flat roofs and gently sloping roofs are ideal for water collection. But bear in mind: the type of waterproofing that you choose is crucial for the effectiveness of the water collection. We recommend that you use TPO roof covering, or bituminous waterproofing, which is available in various finishes. TPO is perfectly suitable for sealing a water tank.

Important considerations for rainwater collection

Are you building a completely new roof and want to collect rainwater? Then it is important to bear in mind that a green roof is less suitable for rainwater collection. In fact, a sloping green roof only yields 25 percent usable water, since the vegetation absorbs most of the water.

Do you plan to convert an older roof to a roof which is suitable for rainwater collection? Then it is advisable to have the roof covering inspected by a professional. That way, you can be sure that the waterproofing is still in good condition.

Want to find out more about rainwater collection via your roof? Or are you interested in a no-obligation roof inspection? Don’t hesitate to contact us for more information.